Severe summer heat continues today mainly in western Japan; 38 degrees Celsius expected in Kumamoto; heat stroke warning

2026/08/19 06:58

Yesterday, the 18th, temperatures rose mainly in western Japan, making it an extremely hot day in 58 locations. In some places, it was as hot as body temperature, with temperatures reaching 37.3c in Oita City and 36.6c in Kumamoto City.

Today, the 19th (Wednesday), many places from western to eastern Japan will be covered in high pressure and will be sunny, with severe lingering heat expected mainly in western Japan.
Today's highest temperature is expected to be 38 degrees Celsius in Kurume City, Fukuoka Prefecture, Saga City, and Kumamoto City. Please continue to take thorough measures to prevent heat stroke.

In addition, the predicted maximum temperatures in each city are Sapporo 28c, Sendai 30c, Tokyo 34c, Nagoya 34c, Kanazawa 34c, Osaka 35c, Kochi 34c, and Fukuoka 35c. It can feel hot and humid in many places, so in addition to staying hydrated frequently, it's a good idea to wear breathable clothing.



The Ministry of the Environment and the Japan Meteorological Agency have issued heatstroke warning alerts from western Japan to Kanto, covering 14 prefectures.

#Area covered by heat stroke warning alert
Tokyo, Kyoto, Wakayama, Hiroshima, Shimane, Tottori, Kagawa, Ehime, Fukuoka, Oita, Nagasaki, Saga, Kumamoto, Kagoshima (Excluding the Amami region)

In areas where a heatstroke warning has been issued, there is a risk of damage to human health due to heatstroke due to extremely high temperatures.
Please refrain from activities during hot hours as much as possible, and be conscious of taking frequent breaks and replenishing hydration and salt intake.
Also, try to stay indoors in a cool environment by using an air conditioner, and take precautions against heat stroke indoors.

Today's weather (Wednesday 19th): Sunny from Tohoku to Kyushu; watch out for thunderstorms in Okinawa

2026/08/19 06:34

Today, the 19th (Wednesday), there will continue to be a high pressure system centered over the east of Japan, and many parts of Honshu will be sunny. On the other hand, due to the approaching tropical cyclone, it seems that Okinawa will need to be careful about the intensifying rain.



Clouds tend to spread in Hokkaido, and there are many places where it will rain, especially on the Sea of Japan side. Please bring rain gear when going out. . There is a possibility of showers even on the Pacific side, so it's a good idea to bring a folding umbrella.

It is expected to be sunny in many places from Tohoku to Kyushu. Continuing from the previous day, temperatures will continue to rise in western Japan, so it is important to be careful about heatstroke. In addition, atmospheric conditions will become unstable in the afternoon, and rain clouds are expected to develop locally, mainly along the mountains. If you are going for leisure activities in the mountains, please be aware of changes in the sky.

Okinawa is expected to experience heavy rain and strong winds due to the effects of a tropical cyclone. There is a risk of heavy rain and thunderstorms mainly in the Sakishima Islands, so please be careful of heavy rain, strong winds, and high waves.

New typhoon forecast: The next one will be Typhoon No. 18, so be careful in the future

2026/08/19 01:44

The Japan Meteorological Agency announced that the tropical cyclone currently developing in the Truk Islands is expected to develop into a typhoon within the next 24 hours.
The next occurrence will be ``Typhoon No. 18'', making it the fifth typhoon to occur this month.

#Typhoon No. 18 19th (Wednesday) 0:00
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Center location Near Truk Islands
Movement West Slowly
Central pressure 1004 hPa
Maximum wind speed 15 m/s (near the center)
Maximum instantaneous wind speed 23 m/s
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The typhoon is expected to move northwards around the 20th (Thursday), change its course to the northwest, and move northwest across the Mariana Islands with strong force until the 23rd (Sunday). There is a great deal of uncertainty about the course that will follow, but please pay close attention to future information as it may have an impact on Japan.

Tomorrow, the 19th (Wednesday), will continue to be dangerously hot in western Japan, with 38 degrees Celsius expected in Kumamoto City and other areas.

2026/08/18 18:16

Today, the 18th (Tuesday), the sun was shining in many places due to the effects of high pressure, making it extremely hot especially in northern Kyushu. Tomorrow, the 19th (Wednesday), the range of dangerous heat will further expand, and the severe lingering heat will continue mainly in western Japan, but also in eastern Japan. Please note that there will be thunderstorms in the afternoon of tomorrow, the 19th (Wednesday), mainly in inland areas of Honshu, so please be aware of sudden changes in the weather.

Today, the 18th (Tuesday), temperatures rose from the morning mainly in northern Kyushu and the Sea of Japan side due to the warm air and sunlight in the sky.
The temperature was 37.3 degrees Celsius in Oita City and 36.9 degrees Celsius in Dazaifu (Fukuoka), which are at or above body temperature.
Furthermore, some places in the Hokuriku region, such as Fukui and Toyama, experienced extremely hot days with temperatures exceeding 35 degrees Celsius.







Tomorrow, the 19th (Wednesday), there will be many extremely hot days in western Japan, with maximum temperatures expected to reach 38 degrees Celsius in Kumamoto City, Saga City, and Kurume City, Fukuoka Prefecture.In northern Kyushu, there will be places where the temperature will rise to around 38 degrees Celsius, dangerously exceeding body temperature.

Please refrain from going out unless necessary and take measures such as taking breaks in the shade every 15 minutes when working outdoors. When fatigue and lack of sleep are compounded by consecutive days of heat, symptoms of heatstroke may suddenly appear. Please take all possible precautions, such as drinking plenty of water and salt.

Weather for the week: The lingering summer heat will continue to be severe across the country, and the weather will be cloudy and unrefreshing on the weekend.

2026/08/18 14:20

From now on, the area around Honshu will continue to be covered in summer high pressure, and it looks like it will be extremely hot day after day, especially in western Japan. However, there will be days when a low pressure system or front will pass near Honshu, and there will be days when it rains over a wide area.



The atmospheric pressure distribution will be the same as tomorrow the 19th (Wednesday) and today the 18th (Tuesday). The area around Honshu will be covered by a high-pressure system centered east of the Kuril Islands, and warm winds from the south to southwest will blow into the Pacific Ocean.
The Sea of Japan side of western Japan is likely to get even hotter in some places due to the current situation as southerly winds cross over mountainous areas. The maximum daytime temperature is around 35c in western Japan, with many places experiencing extremely hot days. Temperatures are expected to reach 38c in Kurume City and Saga, Fukuoka Prefecture, and 37c in Hita City and Kumamoto, Oita Prefecture, making it dangerously hot to exceed body temperature. Be wary of heat stroke, drink plenty of water and salt, and take adequate breaks.

In the Sakishima Islands, rain is expected to increase in the morning due to the effects of a tropical cyclone, so please be careful of heavy rain accompanied by thunder.
In northern Japan, rain is likely to be concentrated mainly on the Sea of Japan side due to the influence of the front. In the afternoon, there are likely to be localized rain and thunderstorms mainly along the mountains from Tohoku to Kyushu and inland.

A front and low pressure system will pass near Honshu from around the 20th to the 22nd. On the 20th, the rain will become heavier mainly on the Sea of Japan coast, including northern Japan and Hokuriku, and on the 21st, it will likely rain over a wide area from northern Japan to western Japan. The front is expected to move away to the east of Japan on the 22nd, but the weather is expected to continue to be cloudy and cloudy across the country. There is a possibility of sudden rain and thunderstorms in the afternoon, especially inland and along the mountains, so please keep an eye on changes in the sky.




From now on, temperatures will remain at or above normal. Western Japan is experiencing severe heat, with temperatures approaching 35 degrees Celsius every day. Eastern Japan is not expected to be as hot as western Japan, but the maximum temperature will continue to be over 30 degrees Celsius, and there will be many humid and humid days.
Please be careful of heatstroke and infectious diseases during recovery work in Kumamoto Prefecture, which experienced a strong earthquake, and areas that were severely damaged by the heavy rains in Chiba on the 13th last week.

Weather for today, the 18th (Tuesday): It rains a lot in Hokkaido, and it's sunny and extremely hot in parts of Honshu.

2026/08/18 06:54

Today, the 18th (Tuesday), it will be rainy in Hokkaido, where the atmospheric pressure is low, and there will be many sunny spells around Honshu, which is covered in high pressure.
Temperatures are expected to rise mainly on the Sea of Japan side, with some places in western Japan expected to experience extreme heat. Please be careful of heat stroke.



There are low pressure systems in Northeast China and the Sea of Japan, both moving northeast. On the other hand, there is a high pressure system far to the east of Japan that is overhanging the vicinity of Japan.
Currently, it is raining in some places on the Sea of Japan side of Hokkaido, the Pacific side of western Japan, and Yamaguchi Prefecture due to the influence of moist air circulating around the pressure trough and the edge of the high pressure system.



Today, Hokkaido is expected to experience a pressure trough, and rain clouds are expected to form mainly on the Sea of Japan side. You will need an umbrella when going out.

Tohoku to Kyushu are expected to have many places with sunshine, but on the Pacific side, clouds will likely spread due to the influence of moist air circulating around the edge of the high pressure system. In particular, the southern Kii Peninsula and the Pacific side of Shikoku, where warm, humid air flows, have periods of rain, so please be aware that there may be localized areas of heavy rain.

It will be mostly sunny in Okinawa.



The predicted maximum temperature is expected to be lower in many places than yesterday (Monday), the 17th, due to the abundance of clouds in Hokkaido, while temperatures in Tohoku to Kyushu will be higher than yesterday, especially on the Sea of Japan side where winds blow over the mountains.
In western Japan, it is predicted that there will be some places in Tottori, Fukuoka, Oita, Saga, and Kumamoto that will experience extremely hot days with temperatures reaching 35 degrees Celsius.
The temperature in the Kanto region is also higher than yesterday, and even in Chiba, where there was heavy rain in Chiba in August 2020, a midsummer day is expected to reach 31 degrees Celsius.
If you are working on recovery work in Kumamoto or Chiba, please take precautions against heatstroke, such as taking frequent breaks in a cool place.

The severe lingering heat continues, and even in western Japan, where a very hot day is expected tomorrow on the 18th, be on guard against heat stroke.

2026/08/17 22:55

Temperatures rose today, the 17th (Monday), mainly in the Kyushu region, with some places experiencing an extremely hot day with temperatures exceeding 35c.
In Bungotakada, Bungotakada City, Oita Prefecture, the temperature was 37.2c at 12:39 p.m., and in Asakura, Asakura City, Fukuoka Prefecture, the temperature was 36.4c at 1:50 p.m.

Tomorrow, the 18th (Tuesday), the area around Honshu will be covered by a high-pressure system centered far east of Japan, and the sun is expected to reach many areas, resulting in high temperatures.
In particular, winds will blow from the east to southeast, so temperatures are expected to rise mainly on the Sea of Japan side, where the air flows over the mountains, making it extremely hot.
On the Pacific side, there will be a lot of clouds due to the humid air, but it will feel hot and humid.
On the other hand, the Hokkaido region is expected to be cloudy and rainy in some places due to the influence of a low-pressure system moving through the Sea of Japan. The rise in temperature will be suppressed compared to today.



It will be a very hot day with temperatures of 35c in Matsue and Kumamoto, and 34c in Niigata, Tottori, Fukuoka, Kagoshima, and Osaka.
In the Kanto region, the temperature in Tokyo is expected to be 33c, about 3c higher than today. For the past few days, there have been days where the temperature has not reached 30 degrees Celsius, so it looks like the heat will be hard on the body.
Chiba in August 2020 Even in Chiba, where heavy rains occurred, temperatures are expected to reach 32 degrees Celsius. Those involved in recovery work should take precautions against heat stroke, such as taking frequent breaks in a cool place.



It is expected that many locations will continue to experience midsummer days with temperatures of 30c or higher even after tomorrow. Until around the 20th (Thursday), some places will experience extreme heat with temperatures approaching 35 degrees Celsius.
Even in the Hokkaido region, there will be places where the temperature will reach 30 degrees Celsius for a while.

Please continue to take precautions against heat stroke. Make sure to replenish your fluids frequently before you get thirsty, and replenish your intake of salt if you sweat. Also, please use the air conditioner appropriately when indoors.

Today, the 17th (Monday), the weather is cloudy in many places in the afternoon. Rainy conditions continue on the Pacific side of western Japan and northern Kyushu.

2026/08/17 13:22

Cloudy weather will continue across the country into the afternoon of today, Monday, the 17th, and there will be intermittent rain in some places, mainly on the Pacific side of western Japan. Don't forget to bring a folding umbrella when you go out.



A low-pressure system is moving northeast near the Korean Peninsula, and the atmospheric conditions near Honshu are expected to remain unstable in the afternoon as warm, humid air flows toward the low-pressure system.




The Pacific side of western Japan, such as Kochi Prefecture and southern Mie Prefecture, will continue to experience rainy weather. Be careful of localized heavy rain and thunderstorms.

Also, there are likely to be some places in the northern Kyushu region where it will rain due to the effects of the low pressure system. In particular, there is a risk of heavy rain in Iki and Tsushima in Nagasaki Prefecture, so caution is required.

There is also a possibility of rain showers on the Seto Inland Sea and the Japan Sea side.

On the other hand, temperatures are expected to rise in sunny areas and it will be midsummer in some places. Please be careful about heat stroke.

Be careful of sudden rain and lingering heat on Monday the 17th; temperatures are rapidly increasing in the Kanto region

2026/08/17 07:37

Today, the 17th (Monday), which marks the end of the Obon holiday for many people, the sun will shine in northern Japan, but clouds are expected to spread over wide areas in eastern and western Japan.

Due to the influence of moist air and pressure troughs from the Pacific Ocean side, it is easy to rain in southern Shikoku and the Chugoku region,
There is also a possibility that it may rain locally from Kanto to Kyushu. You need to be careful about sudden changes in the weather.
Just in case, it's a good idea to bring a folding umbrella.




Also, as warm air flows in from the south, daytime temperatures in the Kanto region will be significantly higher than yesterday.
Western Japan is also expected to continue experiencing a very hot and humid summer.

From here on out, clouds are likely to spread across northern and western Japan due to the influence of humid air, and the humid, oppressive heat will continue.



To avoid getting sick early after the holidays,
please take precautions against heatstroke, such as by drinking water frequently.

17th (Monday): Heavy rain possible from northern Kyushu to western Japan; caution due to stagnant shear line

2026/08/16 22:42

A low pressure system is moving northeast near the Korean Peninsula.
Currently, there are active rain clouds near the Tsushima Strait.



This low pressure system is expected to move toward the vicinity of Primorye on the night of the 18th (Tuesday).
Warm and humid air is flowing towards the low pressure system, causing unstable atmospheric conditions in the area.

Also, a sheer line extending from the low pressure system will extend over northern Kyushu,
tomorrow, the 17th (Monday), clouds will likely spread mainly over western and eastern Japan, and showers and thunderstorms are likely to occur in places.
Although there will be periods of sunshine in northern Japan, it is expected to rain in Sendai at night.



There is a risk of active rain clouds forming in northern Kyushu and western Japan tomorrow.
There are likely to be heavy rain in Iki, Tsushima, and Goto in Nagasaki into Monday.



If rain clouds continue, the risk of landslides, flooding of low-lying land, and rising river waters will increase.
Please check the weather forecast in your area and be careful of sudden weather changes.